C31231211111133131211113313231333133313331333131333132322331221   >>    C3123121111113313121111331323133313331333133313133313232233122   <<    C31231211111133131211113313231333133313331333131333132322331223   >>      C31231211111133131211113313231333133313331333131333132322331222   >>